Objective Barebones Pro is the easiest way to complete the challenge "The Loner" (get a 10 kill streak with no killstreak rewards enabled) due to the games' primary objective not being killing opposing players, and there is no purpose in enabling any of the three killstreaks as they are disabled anyway.

The game type is called 'Objective Barebones Pro' even though there is no original 'Objective Barebones'.